Add PDF image optimization

[trevor-e]

Won't merge until I find some good PDF examples to test against.

[codecov]

Codecov Report

❌ Patch coverage is 19.23077% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.25%. Comparing base (88f711b) to head (13e815c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...aunchpad/size/insights/apple/image_optimization.py	19.23%	20 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   76.29%   76.25%   -0.04%     
==========================================
  Files         132      134       +2     
  Lines       10452    10595     +143     
  Branches     1168     1182      +14     
==========================================
+ Hits         7974     8079     +105     
- Misses       2067     2098      +31     
- Partials      411      418       +7     

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